<template>
  <div
    ref="echartsPie"
    class="echartsPie"
    
  ></div>
</template>
<script setup>
import { ref, onMounted, watch } from "vue";
//  按需引入 echarts
import * as echarts from "echarts";
import "echarts-gl";
const echartsPie = ref(); // 使用ref创建虚拟DOM引用，使用时用main.valued

let props = defineProps({
  options: Object,
  titleName: String
});
let myChart = null;
onMounted(() => {
   window.addEventListener('resize', resizeChart);
});

function resizeChart() {
  if (myChart) {
    myChart.resize();
  }
} 

watch(
  () => props.options,
  (newval, oldval) => {
    init(newval);
  }
);

function getParametricEquation(
  startRatio,
  endRatio,
  isSelected,
  isHovered,
  k,
  height
) {
  // 计算
  let midRatio = (startRatio + endRatio) / 2;

  let startRadian = startRatio * Math.PI * 2;
  let endRadian = endRatio * Math.PI * 2;
  let midRadian = midRatio * Math.PI * 2;

  // 如果只有一个扇形，则不实现选中效果。
  if (startRatio === 0 && endRatio === 1) {
    isSelected = false;
  }

  // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
  k = typeof k !== "undefined" ? k : 1 / 3;

  // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
  let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
  let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;

  // 计算高亮效果的放大比例（未高亮，则比例为 1）
  let hoverRate = isHovered ? 1.05 : 1;

  // 返回曲面参数方程
  return {
    u: {
      min: -Math.PI,
      max: Math.PI * 3,
      step: Math.PI / 32,
    },

    v: {
      min: 0,
      max: Math.PI * 2,
      step: Math.PI / 20,
    },

    x: function (u, v) {
      if (u < startRadian) {
        return (
          offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      if (u > endRadian) {
        return (
          offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
    },

    y: function (u, v) {
      if (u < startRadian) {
        return (
          offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      if (u > endRadian) {
        return (
          offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
    },

    z: function (u, v) {
      if (u < -Math.PI * 0.5) {
        return  Math.sin(u);
      }
      if (u > Math.PI * 2.5) {
        return Math.sin(u);
      }
      return Math.sin(v) > 0 ? 1 * height : -1;
    },
  };
}

// 生成模拟 3D 饼图的配置项
function getPie3D(pieData, internalDiameterRatio) {
  let series = [];
  let sumValue = 0;
  let startValue = 0;
  let endValue = 0;
  let legendData = [];
  let k =
    typeof internalDiameterRatio !== "undefined"
      ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
      : 1 / 3;

  // 为每一个饼图数据，生成一个 series-surface 配置
  for (let i = 0; i < pieData.length; i++) {
    sumValue += pieData[i].value;

    let seriesItem = {
      name:
        typeof pieData[i].name === "undefined" ? `series${i}` : pieData[i].name,
      type: "surface",
      parametric: true,
      wireframe: {
        show: false,
      },
      pieData: pieData[i],
      pieStatus: {
        selected: false,
        hovered: false,
        k: k,
      },
    };

    if (typeof pieData[i].itemStyle != "undefined") {
      let itemStyle = {};

      typeof pieData[i].itemStyle.color != "undefined"
        ? (itemStyle.color = pieData[i].itemStyle.color)
        : null;
      typeof pieData[i].itemStyle.opacity != "undefined"
        ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
        : null;

      seriesItem.itemStyle = itemStyle;
    }
    series.push(seriesItem);
  }

  // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
  // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
  for (let i = 0; i < series.length; i++) {
    endValue = startValue + series[i].pieData.value;
    // console.log(series[i]);
    series[i].pieData.startRatio = startValue / sumValue;
    series[i].pieData.endRatio = endValue / sumValue;
    series[i].parametricEquation = getParametricEquation(
      series[i].pieData.startRatio,
      series[i].pieData.endRatio,
      false,
      false,
      k,
      series[i].pieData.value
    );

    startValue = endValue;

    legendData.push(series[i].name);
  }
  return series;
}


async function init(newval) {
  // 基于准备好的dom，初始化echarts实例
  if (!myChart) {
    myChart = echarts.init(echartsPie.value);
  }
  // 传入数据生成 option
  const optionsData = newval
  const series = getPie3D(optionsData, 0.8, 240, 28, 26, 0.5);
  series.push({
    name: "pie2d",
    type: "pie",
    label: {
      top: "-30%",
      opacity: 1,
      fontSize: 14,
      lineHeight: 14,
      textStyle: {
        fontSize: 14,
        color: "#999999",
      },
    },
    title: {
      x: "center",
      top: "20",
      textStyle: {
        color: "#999999",
        fontSize: 22,
      },
    },
    labelLine: {
      length: 30,
      length2: 40,
    },
    startAngle: -90, //起始角度，支持范围[0, 360]。
    clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
    // radius: ["40%", "40%"],
    // center: ["50%", "40%"],
     radius: ["30%", "30%"],
    center: ["50%", "40%"],
    data: optionsData,
    itemStyle: {
      opacity: 0,
    },
  });
  // 准备待返回的配置项，把准备好的 legendData、series 传入。
  let option = {
    legend: {
      show: false,
      tooltip: {
        show: true,
      },
      orient: "horizontal",
      data: newval.map(item => item.name),
      bottom: "10%",
      center: "center",
      itemGap: 14,
      itemHeight: 8,
      itemWidth: 17,
      // bottom: '50%',
      // right: "2%",
      // bottom: "90%",
      textStyle: {
        color: "#999999",
        fontSize: 12,
      },
    },
    animation: true,
    tooltip: {
      formatter: (params) => {
        if (
          params.seriesName !== "mouseoutSeries" &&
          params.seriesName !== "pie2d"
        ) {
          return `${
            params.seriesName
          }<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${
            params.color
          };"></span>${option.series[params.seriesIndex].pieData.value}`;
        }
      },
      textStyle: {
        fontSize: 14,
      },
    },
    title: {
      show: true,
      text: props.titleName,
      x: "center",
      top: "35%",
      textStyle: {
        color: "#333333",
        fontSize: 14,
      },
    },
    backgroundColor: "#fff",
    labelLine: {
      show: false,
      lineStyle: {
        color: "#7BC0CB",
      },
      normal: {
        show: true,
        length: 10,
        length2: 10,
      },
    },
    label: {
      show: false,
      position: "outside",
      formatter: "{b} \n{d}%",
      textStyle: {
        color: "#999999",
        fontSize: "12px",
      },
    },
    xAxis3D: {
      min: -1,
      max: 1,
    },
    yAxis3D: {
      min: -1,
      max: 1,
    },
    zAxis3D: {
      min: -1,
      max: 1,
    },
    grid3D: {
      show: false,
      boxHeight: 0.01,
      top: "-10%",
      // bottom: "50%",
      // environment: "rgba(255,255,255,0)",
      viewControl: {
        distance: 180,
        alpha: 25,
        beta: 60,
        autoRotate: false, // 自动旋转
        rotateSensitivity: 0, // 禁止缩放
        zoomSensitivity: 0,
        panSensitivity:0
      },
    },
    series: series,
  };

  myChart.setOption(option);
}
</script>
<style scoped>
.echartsPie {
  width: 100%;
  height: 100%;
}
</style>
